Python - E-Paper 296x128 Bricklet

This is the description of the Python API bindings for the E-Paper 296x128 Bricklet. General information and technical specifications for the E-Paper 296x128 Bricklet are summarized in its hardware description.

An installation guide for the Python API bindings is part of their general description.

Examples

The example code below is Public Domain (CC0 1.0).

Hello World

Download (example_hello_world.py)

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

HOST = "localhost"
PORT = 4223
UID = "XYZ" # Change XYZ to the UID of your E-Paper 296x128 Bricklet

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_e_paper_296x128 import BrickletEPaper296x128

if __name__ == "__main__":
    ipcon = IPConnection() # Create IP connection
    ep = BrickletEPaper296x128(UID, ipcon) # Create device object

    ipcon.connect(HOST, PORT) # Connect to brickd
    # Don't use device before ipcon is connected

    # Use black background
    ep.fill_display(ep.COLOR_BLACK)

    # Write big white "Hello World" in the middle of the screen
    ep.draw_text(16, 48, ep.FONT_24X32, ep.COLOR_WHITE, ep.ORIENTATION_HORIZONTAL,
                 "Hello World")
    ep.draw()

    raw_input("Press key to exit\n") # Use input() in Python 3
    ipcon.disconnect()

Load Image

Download (example_load_image.py)

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

HOST = "localhost"
PORT = 4223
UID = "XYZ" # Change XYZ to the UID of your E-Paper 296x128 Bricklet

WIDTH = 296 # Columns
HEIGHT = 128 # Rows

from tinkerforge.ip_connection import IPConnection
from tinkerforge.bricklet_e_paper_296x128 import BrickletEPaper296x128
from PIL import Image

# Convert PIL image to matching color bool list
def bool_list_from_pil_image(image, width=296, height=128, color=(0, 0, 0)):
    image_data = image.load()
    pixels = []

    for row in range(height):
        for column in range(width):
            pixel = image_data[column, row]
            value = (pixel[0] == color[0]) and (pixel[1] == color[1]) and (pixel[2] == color[2])
            pixels.append(value)
    
    return pixels

if __name__ == "__main__":
    ipcon = IPConnection() # Create IP connection
    epaper = BrickletEPaper296x128(UID, ipcon) # Create device object

    ipcon.connect(HOST, PORT) # Connect to brickd
    # Don't use device before ipcon is connected

    # Download example image here:
    # https://raw.githubusercontent.com/Tinkerforge/e-paper-296x128-bricklet/master/software/examples/tf_red.png
    image = Image.open('tf_red.png')

    # Get black/white pixels from image and write them to the Bricklet buffer
    pixels_bw  = bool_list_from_pil_image(image, WIDTH, HEIGHT, (0xFF, 0xFF, 0xFF))
    epaper.write_black_white(0, 0, WIDTH-1, HEIGHT-1, pixels_bw)

    # Get red pixels from image and write them to the Bricklet buffer
    pixels_red = bool_list_from_pil_image(image, WIDTH, HEIGHT, (0xFF, 0, 0))
    epaper.write_color(0, 0, WIDTH-1, HEIGHT-1, pixels_red)

    # Draw buffered values to the display
    epaper.draw()

    raw_input("Press key to exit\n") # Use input() in Python 3
    ipcon.disconnect()

API

Generally, every function of the Python bindings can throw an tinkerforge.ip_connection.Error exception that has a value and a description property. value can have different values:

  • Error.TIMEOUT = -1
  • Error.NOT_ADDED = -6 (unused since Python bindings version 2.0.0)
  • Error.ALREADY_CONNECTED = -7
  • Error.NOT_CONNECTED = -8
  • Error.INVALID_PARAMETER = -9
  • Error.NOT_SUPPORTED = -10
  • Error.UNKNOWN_ERROR_CODE = -11
  • Error.STREAM_OUT_OF_SYNC = -12
  • Error.INVALID_UID = -13
  • Error.NON_ASCII_CHAR_IN_SECRET = -14

All functions listed below are thread-safe.

Basic Functions

BrickletEPaper296x128(uid, ipcon)
Parameters:
  • uid – Type: str
  • ipcon – Type: IPConnection
Returns:
  • e_paper_296x128 – Type: BrickletEPaper296x128

Creates an object with the unique device ID uid:

e_paper_296x128 = BrickletEPaper296x128("YOUR_DEVICE_UID", ipcon)

This object can then be used after the IP Connection is connected (see examples above).

BrickletEPaper296x128.draw()
Returns:
  • None

Draws the current black/white and red or gray buffer to the e-paper display.

The Bricklet does not have any double-buffering. You should not call this function while writing to the buffer. See get_draw_status().

BrickletEPaper296x128.get_draw_status()
Returns:
  • draw_status – Type: int, Range: See constants

Returns one of three draw statuses:

  • Idle
  • Copying: Data is being copied from the buffer of the Bricklet to the buffer of the display.
  • Drawing: The display is updating its content (during this phase the flickering etc happens).

You can write to the buffer (through one of the write or draw functions) when the status is either idle or drawing. You should not write to the buffer while it is being copied to the display. There is no double-buffering.

The following constants are available for this function:

For draw_status:

  • BrickletEPaper296x128.DRAW_STATUS_IDLE = 0
  • BrickletEPaper296x128.DRAW_STATUS_COPYING = 1
  • BrickletEPaper296x128.DRAW_STATUS_DRAWING = 2
BrickletEPaper296x128.write_black_white(x_start, y_start, x_end, y_end, pixels)
Parameters:
  • x_start – Type: int, Range: [0 to 295]
  • y_start – Type: int, Range: [0 to 127]
  • x_end – Type: int, Range: [0 to 295]
  • y_end – Type: int, Range: [0 to 127]
  • pixels – Type: [bool, ...], Length: variable
Returns:
  • None

Writes black/white pixels to the specified window into the buffer.

The pixels are written into the window line by line top to bottom and each line is written from left to right.

The value 0 (false) corresponds to a black pixel and the value 1 (true) to a white pixel.

This function writes the pixels into the black/white pixel buffer, to draw the buffer to the display use draw().

Use write_color() to write red or gray pixels.

BrickletEPaper296x128.read_black_white(x_start, y_start, x_end, y_end)
Parameters:
  • x_start – Type: int, Range: [0 to 295]
  • y_start – Type: int, Range: [0 to 127]
  • x_end – Type: int, Range: [0 to 295]
  • y_end – Type: int, Range: [0 to 127]
Returns:
  • pixels – Type: [bool, ...], Length: variable

Returns the current content of the black/white pixel buffer for the specified window.

The pixels are read into the window line by line top to bottom and each line is read from left to right.

The current content of the buffer does not have to be the current content of the display. It is possible that the data was not drawn to the display yet and after a restart of the Bricklet the buffer will be reset to black, while the display retains its content.

BrickletEPaper296x128.write_color(x_start, y_start, x_end, y_end, pixels)
Parameters:
  • x_start – Type: int, Range: [0 to 295]
  • y_start – Type: int, Range: [0 to 127]
  • x_end – Type: int, Range: [0 to 295]
  • y_end – Type: int, Range: [0 to 127]
  • pixels – Type: [bool, ...], Length: variable
Returns:
  • None

The E-Paper 296x128 Bricklet is available with the colors black/white/red and black/white/gray. Depending on the model this function writes either red or gray pixels to the specified window into the buffer.

The pixels are written into the window line by line top to bottom and each line is written from left to right.

The value 0 (false) means that this pixel does not have color. It will be either black or white (see write_black_white()). The value 1 (true) corresponds to a red or gray pixel, depending on the Bricklet model.

This function writes the pixels into the red or gray pixel buffer, to draw the buffer to the display use draw().

Use write_black_white() to write black/white pixels.

BrickletEPaper296x128.read_color(x_start, y_start, x_end, y_end)
Parameters:
  • x_start – Type: int, Range: [0 to 295]
  • y_start – Type: int, Range: [0 to 127]
  • x_end – Type: int, Range: [0 to 295]
  • y_end – Type: int, Range: [0 to 127]
Returns:
  • pixels – Type: [bool, ...], Length: variable

Returns the current content of the red or gray pixel buffer for the specified window.

The pixels are written into the window line by line top to bottom and each line is written from left to right.

The current content of the buffer does not have to be the current content of the display. It is possible that the data was not drawn to the display yet and after a restart of the Bricklet the buffer will be reset to black, while the display retains its content.

BrickletEPaper296x128.fill_display(color)
Parameters:
  • color – Type: int, Range: See constants
Returns:
  • None

Fills the complete content of the display with the given color.

This function writes the pixels into the black/white/red|gray pixel buffer, to draw the buffer to the display use draw().

The following constants are available for this function:

For color:

  • BrickletEPaper296x128.COLOR_BLACK = 0
  • BrickletEPaper296x128.COLOR_WHITE = 1
  • BrickletEPaper296x128.COLOR_RED = 2
  • BrickletEPaper296x128.COLOR_GRAY = 2
BrickletEPaper296x128.draw_text(position_x, position_y, font, color, orientation, text)
Parameters:
  • position_x – Type: int, Range: [0 to 295]
  • position_y – Type: int, Range: [0 to 127]
  • font – Type: int, Range: See constants
  • color – Type: int, Range: See constants
  • orientation – Type: int, Range: See constants
  • text – Type: str, Length: up to 50
Returns:
  • None

Draws a text with up to 50 characters at the pixel position (x, y).

You can use one of 9 different font sizes and draw the text in black/white/red|gray. The text can be drawn horizontal or vertical.

This function writes the pixels into the black/white/red|gray pixel buffer, to draw the buffer to the display use draw().

The following constants are available for this function:

For font:

  • BrickletEPaper296x128.FONT_6X8 = 0
  • BrickletEPaper296x128.FONT_6X16 = 1
  • BrickletEPaper296x128.FONT_6X24 = 2
  • BrickletEPaper296x128.FONT_6X32 = 3
  • BrickletEPaper296x128.FONT_12X16 = 4
  • BrickletEPaper296x128.FONT_12X24 = 5
  • BrickletEPaper296x128.FONT_12X32 = 6
  • BrickletEPaper296x128.FONT_18X24 = 7
  • BrickletEPaper296x128.FONT_18X32 = 8
  • BrickletEPaper296x128.FONT_24X32 = 9

For color:

  • BrickletEPaper296x128.COLOR_BLACK = 0
  • BrickletEPaper296x128.COLOR_WHITE = 1
  • BrickletEPaper296x128.COLOR_RED = 2
  • BrickletEPaper296x128.COLOR_GRAY = 2

For orientation:

  • BrickletEPaper296x128.ORIENTATION_HORIZONTAL = 0
  • BrickletEPaper296x128.ORIENTATION_VERTICAL = 1
BrickletEPaper296x128.draw_line(position_x_start, position_y_start, position_x_end, position_y_end, color)
Parameters:
  • position_x_start – Type: int, Range: [0 to 295]
  • position_y_start – Type: int, Range: [0 to 127]
  • position_x_end – Type: int, Range: [0 to 295]
  • position_y_end – Type: int, Range: [0 to 127]
  • color – Type: int, Range: See constants
Returns:
  • None

Draws a line from (x, y)-start to (x, y)-end in the given color.

This function writes the pixels into the black/white/red|gray pixel buffer, to draw the buffer to the display use draw().

The following constants are available for this function:

For color:

  • BrickletEPaper296x128.COLOR_BLACK = 0
  • BrickletEPaper296x128.COLOR_WHITE = 1
  • BrickletEPaper296x128.COLOR_RED = 2
  • BrickletEPaper296x128.COLOR_GRAY = 2
BrickletEPaper296x128.draw_box(position_x_start, position_y_start, position_x_end, position_y_end, fill, color)
Parameters:
  • position_x_start – Type: int, Range: [0 to 295]
  • position_y_start – Type: int, Range: [0 to 127]
  • position_x_end – Type: int, Range: [0 to 295]
  • position_y_end – Type: int, Range: [0 to 127]
  • fill – Type: bool
  • color – Type: int, Range: See constants
Returns:
  • None

Draws a box from (x, y)-start to (x, y)-end in the given color.

If you set fill to true, the box will be filled with the color. Otherwise only the outline will be drawn.

This function writes the pixels into the black/white/red|gray pixel buffer, to draw the buffer to the display use draw().

The following constants are available for this function:

For color:

  • BrickletEPaper296x128.COLOR_BLACK = 0
  • BrickletEPaper296x128.COLOR_WHITE = 1
  • BrickletEPaper296x128.COLOR_RED = 2
  • BrickletEPaper296x128.COLOR_GRAY = 2

Advanced Functions

BrickletEPaper296x128.set_update_mode(update_mode)
Parameters:
  • update_mode – Type: int, Range: See constants, Default: 0
Returns:
  • None

Note

The default update mode corresponds to the default e-paper display manufacturer settings. All of the other modes are experimental and will result in increased ghosting and possibly other long-term side effects.

If you want to know more about the inner workings of an e-paper display take a look at this excellent video from Ben Krasnow: https://www.youtube.com/watch?v=MsbiO8EAsGw.

If you are not sure about this option, leave the update mode at default.

Currently there are three update modes available:

  • Default: Settings as given by the manufacturer. An update will take about 7.5 seconds and during the update the screen will flicker several times.
  • Black/White: This will only update the black/white pixel. It uses the manufacturer settings for black/white and ignores the red or gray pixel buffer. With this mode the display will flicker once and it takes about 2.5 seconds. Compared to the default settings there is more ghosting.
  • Delta: This will only update the black/white pixel. It uses an aggressive method where the changes are not applied for a whole buffer but only for the delta between the last and the next buffer. With this mode the display will not flicker during an update and it takes about 900-950ms. Compared to the other two settings there is more ghosting. This mode can be used for something like a flicker-free live update of a text.

With the black/white/red display if you use either the black/white or the delta mode, after a while of going back and forth between black and white the white color will start to appear red-ish or pink-ish.

If you use the aggressive delta mode and rapidly change the content, we recommend that you change back to the default mode every few hours and in the default mode cycle between the three available colors a few times. This will get rid of the ghosting and after that you can go back to the delta mode with flicker-free updates.

The following constants are available for this function:

For update_mode:

  • BrickletEPaper296x128.UPDATE_MODE_DEFAULT = 0
  • BrickletEPaper296x128.UPDATE_MODE_BLACK_WHITE = 1
  • BrickletEPaper296x128.UPDATE_MODE_DELTA = 2
BrickletEPaper296x128.get_update_mode()
Returns:
  • update_mode – Type: int, Range: See constants, Default: 0

Returns the update mode as set by set_update_mode().

The following constants are available for this function:

For update_mode:

  • BrickletEPaper296x128.UPDATE_MODE_DEFAULT = 0
  • BrickletEPaper296x128.UPDATE_MODE_BLACK_WHITE = 1
  • BrickletEPaper296x128.UPDATE_MODE_DELTA = 2
BrickletEPaper296x128.set_display_type(display_type)
Parameters:
  • display_type – Type: int, Range: See constants
Returns:
  • None

Sets the type of the display. The e-paper display is available in black/white/red and black/white/gray. This will be factory set during the flashing and testing phase. The value is saved in non-volatile memory and will stay after a power cycle.

The following constants are available for this function:

For display_type:

  • BrickletEPaper296x128.DISPLAY_TYPE_BLACK_WHITE_RED = 0
  • BrickletEPaper296x128.DISPLAY_TYPE_BLACK_WHITE_GRAY = 1
BrickletEPaper296x128.get_display_type()
Returns:
  • display_type – Type: int, Range: See constants

Returns the type of the e-paper display. It can either be black/white/red or black/white/gray.

The following constants are available for this function:

For display_type:

  • BrickletEPaper296x128.DISPLAY_TYPE_BLACK_WHITE_RED = 0
  • BrickletEPaper296x128.DISPLAY_TYPE_BLACK_WHITE_GRAY = 1
BrickletEPaper296x128.get_spitfp_error_count()
Return Object:
  • error_count_ack_checksum – Type: int, Range: [0 to 232 - 1]
  • error_count_message_checksum – Type: int, Range: [0 to 232 - 1]
  • error_count_frame – Type: int, Range: [0 to 232 - 1]
  • error_count_overflow – Type: int, Range: [0 to 232 - 1]

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

  • ACK checksum errors,
  • message checksum errors,
  • framing errors and
  • overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

BrickletEPaper296x128.set_bootloader_mode(mode)
Parameters:
  • mode – Type: int, Range: See constants
Returns:
  • status – Type: int, Range: See constants

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following constants are available for this function:

For mode:

  • BrickletEPaper296x128.BOOTLOADER_MODE_BOOTLOADER = 0
  • BrickletEPaper296x128.BOOTLOADER_MODE_FIRMWARE = 1
  • BrickletEPaper296x128.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BrickletEPaper296x128.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BrickletEPaper296x128.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4

For status:

  • BrickletEPaper296x128.BOOTLOADER_STATUS_OK = 0
  • BrickletEPaper296x128.BOOTLOADER_STATUS_INVALID_MODE = 1
  • BrickletEPaper296x128.BOOTLOADER_STATUS_NO_CHANGE = 2
  • BrickletEPaper296x128.BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT = 3
  • BrickletEPaper296x128.BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT = 4
  • BrickletEPaper296x128.BOOTLOADER_STATUS_CRC_MISMATCH = 5
BrickletEPaper296x128.get_bootloader_mode()
Returns:
  • mode – Type: int, Range: See constants

Returns the current bootloader mode, see set_bootloader_mode().

The following constants are available for this function:

For mode:

  • BrickletEPaper296x128.BOOTLOADER_MODE_BOOTLOADER = 0
  • BrickletEPaper296x128.BOOTLOADER_MODE_FIRMWARE = 1
  • BrickletEPaper296x128.BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT = 2
  • BrickletEPaper296x128.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT = 3
  • BrickletEPaper296x128.BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT = 4
BrickletEPaper296x128.set_write_firmware_pointer(pointer)
Parameters:
  • pointer – Type: int, Unit: 1 B, Range: [0 to 232 - 1]
Returns:
  • None

Sets the firmware pointer for write_firmware(). The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

BrickletEPaper296x128.write_firmware(data)
Parameters:
  • data – Type: [int, ...], Length: 64, Range: [0 to 255]
Returns:
  • status – Type: int, Range: [0 to 255]

Writes 64 Bytes of firmware at the position as written by set_write_firmware_pointer() before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

BrickletEPaper296x128.set_status_led_config(config)
Parameters:
  • config – Type: int, Range: See constants, Default: 3
Returns:
  • None

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following constants are available for this function:

For config:

  • BrickletEPaper296x128.STATUS_LED_CONFIG_OFF = 0
  • BrickletEPaper296x128.STATUS_LED_CONFIG_ON = 1
  • BrickletEPaper296x128.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BrickletEPaper296x128.STATUS_LED_CONFIG_SHOW_STATUS = 3
BrickletEPaper296x128.get_status_led_config()
Returns:
  • config – Type: int, Range: See constants, Default: 3

Returns the configuration as set by set_status_led_config()

The following constants are available for this function:

For config:

  • BrickletEPaper296x128.STATUS_LED_CONFIG_OFF = 0
  • BrickletEPaper296x128.STATUS_LED_CONFIG_ON = 1
  • BrickletEPaper296x128.STATUS_LED_CONFIG_SHOW_HEARTBEAT = 2
  • BrickletEPaper296x128.STATUS_LED_CONFIG_SHOW_STATUS = 3
BrickletEPaper296x128.get_chip_temperature()
Returns:
  • temperature – Type: int, Unit: 1 °C, Range: [-215 to 215 - 1]

Returns the temperature as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

BrickletEPaper296x128.reset()
Returns:
  • None

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

BrickletEPaper296x128.write_uid(uid)
Parameters:
  • uid – Type: int, Range: [0 to 232 - 1]
Returns:
  • None

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

BrickletEPaper296x128.read_uid()
Returns:
  • uid – Type: int, Range: [0 to 232 - 1]

Returns the current UID as an integer. Encode as Base58 to get the usual string version.

BrickletEPaper296x128.get_identity()
Return Object:
  • uid – Type: str, Length: up to 8
  • connected_uid – Type: str, Length: up to 8
  • position – Type: chr, Range: ["a" to "h", "i", "z"]
  • hardware_version – Type: [int, ...], Length: 3
    • 0: major – Type: int, Range: [0 to 255]
    • 1: minor – Type: int, Range: [0 to 255]
    • 2: revision – Type: int, Range: [0 to 255]
  • firmware_version – Type: [int, ...], Length: 3
    • 0: major – Type: int, Range: [0 to 255]
    • 1: minor – Type: int, Range: [0 to 255]
    • 2: revision – Type: int, Range: [0 to 255]
  • device_identifier – Type: int, Range: [0 to 216 - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). The Raspberry Pi HAT (Zero) Brick is always at position 'i' and the Bricklet connected to an Isolator Bricklet is always as position 'z'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions

BrickletEPaper296x128.register_callback(callback_id, function)
Parameters:
  • callback_id – Type: int
  • function – Type: callable
Returns:
  • None

Registers the given function with the given callback_id.

The available callback IDs with corresponding function signatures are listed below.

Callbacks

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with the register_callback() function of the device object. The first parameter is the callback ID and the second parameter the callback function:

def my_callback(param):
    print(param)

e_paper_296x128.register_callback(BrickletEPaper296x128.CALLBACK_EXAMPLE, my_callback)

The available constants with inherent number and type of parameters are described below.

Note

Using callbacks for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.

BrickletEPaper296x128.CALLBACK_DRAW_STATUS
Callback Parameters:
  • draw_status – Type: int, Range: See constants

Callback for the current draw status. Will be called every time the draw status changes (see get_draw_status()).

The following constants are available for this function:

For draw_status:

  • BrickletEPaper296x128.DRAW_STATUS_IDLE = 0
  • BrickletEPaper296x128.DRAW_STATUS_COPYING = 1
  • BrickletEPaper296x128.DRAW_STATUS_DRAWING = 2

Virtual Functions

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

BrickletEPaper296x128.get_api_version()
Return Object:
  • api_version – Type: [int, ...], Length: 3
    • 0: major – Type: int, Range: [0 to 255]
    • 1: minor – Type: int, Range: [0 to 255]
    • 2: revision – Type: int, Range: [0 to 255]

Returns the version of the API definition implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

BrickletEPaper296x128.get_response_expected(function_id)
Parameters:
  • function_id – Type: int, Range: See constants
Returns:
  • response_expected – Type: bool

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by set_response_expected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

  • BrickletEPaper296x128.FUNCTION_DRAW = 1
  • BrickletEPaper296x128.FUNCTION_WRITE_BLACK_WHITE = 3
  • BrickletEPaper296x128.FUNCTION_WRITE_COLOR = 5
  • BrickletEPaper296x128.FUNCTION_FILL_DISPLAY = 7
  • BrickletEPaper296x128.FUNCTION_DRAW_TEXT = 8
  • BrickletEPaper296x128.FUNCTION_DRAW_LINE = 9
  • BrickletEPaper296x128.FUNCTION_DRAW_BOX = 10
  • BrickletEPaper296x128.FUNCTION_SET_UPDATE_MODE = 12
  • BrickletEPaper296x128.FUNCTION_SET_DISPLAY_TYPE = 14
  • BrickletEPaper296x128.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
  • BrickletEPaper296x128.FUNCTION_SET_STATUS_LED_CONFIG = 239
  • BrickletEPaper296x128.FUNCTION_RESET = 243
  • BrickletEPaper296x128.FUNCTION_WRITE_UID = 248
BrickletEPaper296x128.set_response_expected(function_id, response_expected)
Parameters:
  • function_id – Type: int, Range: See constants
  • response_expected – Type: bool
Returns:
  • None

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is send and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For function_id:

  • BrickletEPaper296x128.FUNCTION_DRAW = 1
  • BrickletEPaper296x128.FUNCTION_WRITE_BLACK_WHITE = 3
  • BrickletEPaper296x128.FUNCTION_WRITE_COLOR = 5
  • BrickletEPaper296x128.FUNCTION_FILL_DISPLAY = 7
  • BrickletEPaper296x128.FUNCTION_DRAW_TEXT = 8
  • BrickletEPaper296x128.FUNCTION_DRAW_LINE = 9
  • BrickletEPaper296x128.FUNCTION_DRAW_BOX = 10
  • BrickletEPaper296x128.FUNCTION_SET_UPDATE_MODE = 12
  • BrickletEPaper296x128.FUNCTION_SET_DISPLAY_TYPE = 14
  • BrickletEPaper296x128.FUNCTION_SET_WRITE_FIRMWARE_POINTER = 237
  • BrickletEPaper296x128.FUNCTION_SET_STATUS_LED_CONFIG = 239
  • BrickletEPaper296x128.FUNCTION_RESET = 243
  • BrickletEPaper296x128.FUNCTION_WRITE_UID = 248
BrickletEPaper296x128.set_response_expected_all(response_expected)
Parameters:
  • response_expected – Type: bool
Returns:
  • None

Changes the response expected flag for all setter and callback configuration functions of this device at once.

Constants

BrickletEPaper296x128.DEVICE_IDENTIFIER

This constant is used to identify a E-Paper 296x128 Bricklet.

The get_identity() function and the IPConnection.CALLBACK_ENUMERATE callback of the IP Connection have a device_identifier parameter to specify the Brick's or Bricklet's type.

BrickletEPaper296x128.DEVICE_DISPLAY_NAME

This constant represents the human readable name of a E-Paper 296x128 Bricklet.